GenericMovementGenerator.cpp

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/*
 * This file is part of the TrinityCore Project. See AUTHORS file for Copyright information
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by the
 * Free Software Foundation; either version 2 of the License, or (at your
 * option) any later version.
 *
 * This program is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
 * more details.
 *
 * You should have received a copy of the GNU General Public License along
 * with this program. If not, see <http://www.gnu.org/licenses/>.
 */
 
#include "GenericMovementGenerator.h"
#include "Creature.h"
#include "CreatureAI.h"
#include "MovementDefines.h"
#include "MoveSpline.h"
#include "Unit.h"
 
GenericMovementGenerator::GenericMovementGenerator(std::function<void(Movement::MoveSplineInit& init)>&& initializer, MovementGeneratorType type, uint32 id) : _splineInit(std::move(initializer)), _type(type), _pointId(id), _duration(0)
{
    Priority = MOTION_PRIORITY_NORMAL;
    Flags = MOVEMENTGENERATOR_FLAG_INITIALIZATION_PENDING;
    BaseUnitState = UNIT_STATE_ROAMING;
}
 
bool GenericMovementGenerator::Initialize(Unit* owner)
{
    if (HasFlag(MOVEMENTGENERATOR_FLAG_DEACTIVATED) && !HasFlag(MOVEMENTGENERATOR_FLAG_INITIALIZATION_PENDING)) // Resume spline is not supported
    {
        RemoveFlag(MOVEMENTGENERATOR_FLAG_DEACTIVATED);
        AddFlag(MOVEMENTGENERATOR_FLAG_FINALIZED);
        return false;
    }
 
    RemoveFlag(MOVEMENTGENERATOR_FLAG_INITIALIZATION_PENDING | MOVEMENTGENERATOR_FLAG_DEACTIVATED);
    AddFlag(MOVEMENTGENERATOR_FLAG_INITIALIZED);
 
    Movement::MoveSplineInit init(owner);
    _splineInit(init);
    _duration.Reset(init.Launch());
    return _duration.GetExpiry() > 0ms;
}
 
bool GenericMovementGenerator::Reset(Unit* owner)
{
    return Initialize(owner);
}
 
bool GenericMovementGenerator::Update(Unit* owner, uint32 diff)
{
    if (!owner || HasFlag(MOVEMENTGENERATOR_FLAG_FINALIZED))
        return false;
 
    // Cyclic splines never expire, so update the duration only if it's not cyclic
    if (!owner->movespline->isCyclic())
        _duration.Update(diff);
 
    if (_duration.Passed() || owner->movespline->Finalized())
    {
        AddFlag(MOVEMENTGENERATOR_FLAG_INFORM_ENABLED);
        return false;
    }
    return true;
}
 
void GenericMovementGenerator::Deactivate(Unit*)
{
    AddFlag(MOVEMENTGENERATOR_FLAG_DEACTIVATED);
}
 
void GenericMovementGenerator::Finalize(Unit* owner, bool/* active*/, bool movementInform)
{
    AddFlag(MOVEMENTGENERATOR_FLAG_FINALIZED);
 
    if (movementInform && HasFlag(MOVEMENTGENERATOR_FLAG_INFORM_ENABLED))
        MovementInform(owner);
}
 
void GenericMovementGenerator::MovementInform(Unit* owner)
{
    if (Creature* creature = owner->ToCreature())
    {
        if (creature->AI())
            creature->AI()->MovementInform(_type, _pointId);
    }
}
 
ImmediateMovementGenerator::ImmediateMovementGenerator(std::function<void(Movement::MoveSplineInit& init)>&& initializer, MovementGeneratorType type, uint32 id)
    : _splineInit(std::move(initializer)), _type(type), _pointId(id)
{
    Priority = MOTION_PRIORITY_NORMAL;
    Flags = MOVEMENTGENERATOR_FLAG_INITIALIZATION_PENDING | MOVEMENTGENERATOR_FLAG_IMMEDIATE;
    BaseUnitState = 0;
}
 
bool ImmediateMovementGenerator::Initialize(Unit* owner)
{
    RemoveFlag(MOVEMENTGENERATOR_FLAG_INITIALIZATION_PENDING);
    AddFlag(MOVEMENTGENERATOR_FLAG_INITIALIZED);
 
    Movement::MoveSplineInit init(owner);
    _splineInit(init);
    int32 duration = init.Launch();
    if (duration <= 0)
        return false;
 
    owner->UpdateSplineMovement(duration); // immediately consume the entire spline
    return true;
}
 
void ImmediateMovementGenerator::Finalize(Unit* owner, bool /*active*/, bool /*movementInform*/)
{
    if (Creature* creature = owner->ToCreature())
        if (creature->AI())
            creature->AI()->MovementInform(_type, _pointId);
}